Percent of total of DiI label (Sertoli cells, UV at 553 nm) and FITC label (nanoparticles, UV 488 nm) 1 h following IV injection of preloaded, prelabeled rat Sertoli cells (SCs) in the mouse host, and percent of total curcumin label (UV at 420 nm) 24 h following IV injection of preloaded rat SCs into the mouse host. Following 1 h postinjection only 26% of SC label was detected in the mouse lungs and no SC label was detected in other organs and tissues tested, whereas 65% of the delivered nannoparticles was detected in the lungs with some detection in the kidney (10%) and liver (5%). Twenty-four hours postinjection, 87% of the curcumin label was detected in the lungs with no detection in other tissues and organs tested. None of the labels were detected in uninjected control mouse lungs.